Vignetter



(No Model.) 4 Sheets-Sheet 1.

H. KUHN.

VIGNBTTER.

N0.13 e3,961. Patented May 31, 1887. 12,91,

' Jui/anfora" l l 0 e'- Ma/2 4 Sheets-Sheet 2.

(No Model.) I

H. KUHN.

A VIGNETTBR. No. 363,961. Patented May 31, 1887.` 11

. 4- Sheets...sheet 3l H' KUHNl l I (No Mom.)

No. 363,961. Patented May 31, 1887.

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(No Model.)

4 Sheets-Sheet 4.

H.KUHN.

VIGNBTTER.

Patented May 31, 1887.

N. PETERLPham-Limugmpher. whngum. 0,0.

UNITED' STATES PATENT OFFICE.,

HENRY KUHN, OF ST. LOUIS, MISSOURI.

VIGNETTER.

SPECIFICATION forming part of Letters Patent No. 363,961, dated May 31, 1887.'

Application filed March 15, 1886. Serial No. 195,368.

To aZZ whom it may concern,.-

Be it known that I, HENRY KUHN, of the city of St. Louis, Missouri, have made a new and useful lmp rovement in Vignetters, of which the following is a full, clear, and exact description.

The present device is used in connection with an ordinary photographers camera, it being placed within the camera between the lens and the negative and employed in the production of photographs with a dark backn ground.

In the annexed drawings, making part of this specication and exhibiting the most desirable modeof carrying` ont the improvement,

' Figurel is a rear elevation ofthe vignetter, its

Central opening being contracted to or toward its smallest diameter. Fig. Zisa similar View, the central opening being enlarged. Fig. 3 is a longitudinal section on the line 3 3 of Fig.'2. Fig. 4. is aside elevation of one of the adjustablepoints usedinformingthevignetter. Fig. 5 is a longitudinal section of a camera having the improvementin position for use, and Fig. 6 may be used to represent the kind of picture produced.

- The same letters of reference denote the saine parts in the several figures of the drawings.

.The camera A,Fig. 5, is of the ordinary type, having the customary lens, a, and being constructed aty the plate-holder end a in the usual manner.

B represents the Vignetter in question. It is interposed between the lens and the plateholder, and it is readily and conveniently held in place byscrewing its frame b, as at b', to the frame-work ft2-of the camera. VThefunction of the vignetter is to prevent the passage of the light to the negative saving'in the immediate Vicinity of the picture being photographed, and also to produce the customary vignette effect. Itis also very desirable to be able to enlarge and diminish the central opening in the vignetter to suit the size of picture taken, and to accomplish this by means accessible to ,the operator in the rear of the camera, but not in the way of the passage of the light. With these ends in view a series of what may be termed points, b2, areemployed. The shape (No model.)

of the point is indicated in Fig. 4, it4 being in effect aflat lever, at the inner end being shaped to form the point bi, between its ends, at b, being perforated to enable it to be pivoted to a frame, as hereinafter specified, and at its outer end being slotted at b. These points I)2 are adjusted to jointly form a circular, series, substantially as is represented in Figs. 1 and 2. The points are laid in a spiral manner around the opening, and so at the inner end, to jointly form a'serrated or the equivalent of a serrated edge around the opening C, through which the light from tlielens c passes lo the plate D, upon which the impression is taken. Vignetter is enlarged and diminished in the The following manner, preferably: The points b'l at b4 are pivoted to a circular frame or rim, bf, Figs. 3 and 5, upon the frontend of the frame b. Encircling the rim is a band, b, provided with pins bi, which respectively en` gage in the slots b" of the points b". By turn ing the band bG around upon the rim' b5 the points b2, by reason of the engagement of the pins b7 in the slots b, are swung upon their respective pivots b4, and the effect of the movement of the points b2 is the enlarging` or lessening of the vignetter opening O, according to the direction in which the band b is turned. Fig. l shows the points adjusted to diminish the opening, and Fig. 2 shows them adjusted to enlarge the opening.

. The band b is'operated by means of a bellcrank, F, which is pivoted at f to the vignetterframe b, and whose arm f is pivoted at]C2 to the band b, and whose arm f 3 is provided with apin or handle, f4, which extends through t-he frame b to the inner side thereof, the frame being perforated at bE to admit the bell-crank handle, and to provide for its movement in operating the vignetter, which operation is effected from the rear end of the camera A, and by taking hold of the handlef4 within the frame b and turning the bell-crank on its pivot, and according to the direction in which the bellcrank is turned is the band b adjusted.

The v'ignetter', substantially as described, l

B, consisting of the circular series of pvotcd l oted and connected Substnntwlly as described.

points b2, forming, whether expanded or con- NVitness my hand.

tmcted a continuous serrated edfe around the r f i opening); C, as described. D HENRX :KUHN' 5 2. The combination of the frame b, the pv- Witnesses:

oted points b2, slotted ab b, the rim b, the C. D. MOODY,

band b, the pins D7, and the bell-crank F, piv- J. XV. HOKE. 

